.grid2 {
    display:flex;
    li {
        width:50%;
        max-width: 50%;
        min-width: 50%;
        flex: 1;
    }
}

.grid3 {
    display:flex;
    li {
        width:33.33%;
        max-width: 33.33%;
        min-width: 33.33%;
        flex: 1;
    }
}
.grid4 {
    display:flex;
    li {
        width:25%;
        max-width: 25%;
        min-width: 25%;
        flex: 1;
    }
}
.grid5 {
    display:flex;
    li {
        width:20%;
        max-width: 20%;
        min-width: 20%;
        flex: 1;
    }
}

// 向右箭头 7px
.more7 {
    position: relative;
    &::after {
        content: "";
        display: block;
        position: absolute;
        width: 7px;
        height: 7px;
        border-top: 1px solid #999999;
        border-right: 1px solid #999999;
        top: 50%;
        left: 50%;
        margin-top: -4px;
        margin-left: -4px;
        transform: rotate(45deg);
    }
}

// 向左箭头 11px
.back11 {
    position: relative;
    &::after {
        content: "";
        display: block;
        position: absolute;
        width: 11px;
        height: 11px;
        border-top: 1px solid #ffffff;
        border-left: 1px solid #ffffff;
        top: 50%;
        left: 50%;
        margin-top: -6px;
        margin-left: -6px;
        transform: rotate(-45deg);
    }
}

// 向上箭头 7px
.foldopen {
    position: relative;
    transition-duration: 0.3s;
    &::after {
        content: "";
        display: block;
        position: absolute;
        width: 7px;
        height: 7px;
        border-top: 1px solid #999999;
        border-right: 1px solid #999999;
        top: 50%;
        left: 50%;
        margin-top: -4px;
        margin-left: -4px;
        transform: rotate(-45deg);
    }
}

// 向上箭头 7px
.foldclose {
    position: relative;
    transition-duration: 0.3s;
    &::after {
        content: "";
        display: block;
        position: absolute;
        width: 7px;
        height: 7px;
        border-top: 1px solid #999999;
        border-right: 1px solid #999999;
        top: 50%;
        left: 50%;
        margin-top: -4px;
        margin-left: -4px;
        transform: rotate(135deg);
    }
}